$FE25/65061: Read / Set Top of Memory
Jump from $FF99:
FE25: 90 06 BCC $FE2D
Jump from $F2B2, $F468:
FE27: AE 83 02 LDX $0283 ; Pointer: Top of Memory for Operating System
FE2A: AC 84 02 LDY $0284 ; Pointer: Top of Memory for Operating System
Jump from $FE25, $F480, $FD8D:
FE2D: 8E 83 02 STX $0283 ; Pointer: Top of Memory for Operating System
FE30: 8C 84 02 STY $0284 ; Pointer: Top of Memory for Operating System
FE33: 60 RTS
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